自己写的java返回结果集封装

import java.io.Serializable;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;

/**
 * @Package com.XXX.common.entity
 * @Description: 接口返回结果封装
 * @Author: admin
 * @Date: 2018/5/1610:49
 */
public class Result<T>  implements Serializable {
	
	/**
	 * 版本
	 */
	private static final long serialVersionUID = 1L;

	private final static ObjectMapper objectMapper = new ObjectMapper();

    /**
     * 返回状态码
     */
    private int code;

    /**
     * 返回信息
     */
    private String msg;

    /**
     * 返回数据
     */
    private T data;

    public Result(){

    }

    //构造方法
    public Result(int code, String msg, T data) {
        this.code = code;
        this.msg = msg;
        this.data = data;
    }

    //如果返回数据直接成功
    public Result(T data) {
        this.code = 200;
        this.data = data;
        this.msg = "OK";
    }

    //失败调用
    public Result(int code,String msg){
        this.code = code;
        this.msg = msg;
    }

    //成功直接返回数据和状态
    public static<T> Result<T> ok(T data){
        return new Result<T>(data);
    }

    //失败的时候调用
    public static<T> Result<T> error(int code, String msg){
        return  new Result<T>(code,msg);
    }
    
    //转为JSON
    public static<T> String toJSON(Result<T> result) {
    	 String jsonStr = null;     	
    	try {
    		jsonStr =  objectMapper.writeValueAsString(result);
		} catch (JsonProcessingException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
    	return jsonStr;
    }

    public Integer getCode() {
        return code;
    }

    public void setCode(Integer code) {
        this.code = code;
    }

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }

    public T getData() {
        return data;
    }

    public void setData(T data) {
        this.data = data;
    }
}